Ryanair has posted a 12pc jump in September traffic, carrying 9.6m passengers last month.
This was up from 8.5m during the same month last year.
The airline's load factor, the extent to which planes were full, rose by 4pc to 94pc.
Rolling annual traffic to the end of the month was up by 16pc compared to the same period last year to 90.5m customers.
Chief marketing officer Kenny Jacobs said the figures were partly due to lower fares and the airline's "Always Getting Better" campaign, which chief executive Michael O'Leary has described as "being nicer to customers".
He added that customers can “look forward to further service enhancements” as the company looks to continue rolling out the second year of its improved customer service campaign.
He said this would include features such as a new website and app, new cabin interiors and reduced airport fees.